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Ingredient

Saccharomyces boulardii

Promising

A specific probiotic yeast with well-documented strain-level studies.

How it works

Transient colonization that may compete with pathogens and modulate intestinal immune signalling.

Evidence

Reasonable RCT base for prevention of antibiotic-associated GI upset.

Studies

McFarland, World J Gastroenterol, 2010
Meta-analysis supports S. boulardii for antibiotic-associated GI upset.
PubMed 20140234 ↗

One ingredient, one study, one product worth your money.

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